Malicious PDF — malware analysis report

Static analysis result for SHA-256 d37189806e19b4cd…

MALICIOUS

PDF

86.0 KB Created: 2021-09-16 19:13:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 582300123035e674d8d2aa9b8626ad09 SHA-1: 7cf50dde53907587e276fd0d94078970aaf12974 SHA-256: d37189806e19b4cdb39f37d5338c5741d17ab8b3815d5f324e4a56449a7e993a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. Heuristics reveal it functions as a link farm, pointing to numerous websites, some hosted on compromised CMS uploads. The embedded URLs suggest an attempt to manipulate search engine results or direct users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://td-mg.ru/uploads/files/36989858952.pdf In PDF document text
    • http://dongsimkindergarten.com/upload/files/vutigifaxilila.pdfIn PDF document text
    • https://dangeloremodeling.com/nbloom/fckuploads/file/pewuvipugokote.pdfIn PDF document text
    • http://marktoby.com/akram/know_news/admin/userfiles/file/tuzemukefilazate.pdfIn PDF document text
    • https://netwindowvn.com/uploads/userfiles/file/30356176246.pdfIn PDF document text
    • http://lerucherdesanges.fr/userfiles/file/64925509350.pdfIn PDF document text
    • http://cerezolorente.com/files/cerezolorente/_repo/file/72324471673.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/9c1bd36302d65e30bc2fc23f95f5d46b/bapovilejoluzala.pdfIn PDF document text
    • http://itineraire-consulting.com/ckfinder/userfiles/files/76349772550.pdfIn PDF document text
    • https://www.whoamiandwhyamihere.com/ckfinder/userfiles/files/40877468931.pdfIn PDF document text
    • http://robotsuk.com/luckingbros.co.uk/userfiles/files/zeletipoj.pdfIn PDF document text
    • http://eko-baby.ru/userfiles/file/kekuwiz.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/1b3066786de930be758e3dc7afa7088e/tezoxovuvub.pdfIn PDF document text
    • http://orosweb.hu/userfiles/file/87573423615.pdfIn PDF document text
    • https://ntc-container.com/upload/files/11155605392.pdfIn PDF document text
    • http://www.likoda.com.tw/upload/ckimg/files/82109100201.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613f81cbd4c04---54049349385.pdfIn PDF document text
    • https://unitedfightalliance.com/ckfinder/userfiles/files/33799452473.pdfIn PDF document text
    • http://ajtoablakcentrum.com/_user/file/wekuxe.pdfIn PDF document text
    • http://jedwines.com/cmsCart/upload/file/68397215509.pdfIn PDF document text
    • http://hotel-ambassador-nice.com/upload/files/18921780873.pdfIn PDF document text
    • https://martas.vodrsport.cz/uploads/files/vefejon.pdfIn PDF document text
    • https://spa-salon.ru/ckfinder/userfiles/files/57333173709.pdfIn PDF document text
    • http://chenruichem.com/upload/files/tipazemu.pdfIn PDF document text
    • https://duproject.com/uploadEditor/files/27426755791.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=best+mobile+wallet+app+for+androidPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ebe8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBE8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000103ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103FF 10940 bytes
SHA-256: 89072f8bd285da803cac21043c88422be497bfa7c9809301cbcc07e6ce927e5f
font_02_sfnt_off00011d2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D2D 17268 bytes
SHA-256: fa897c1044de785a29dcfc059e75a0ae67bb9c481503c0d6204a05d18f611659